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@Fishguy -
Ok, ignore the current setup than,Like I already said, I don't plan on adding anything right now anyway. If it were somehow ideal setup (whatever you might consider that to be) do you know of any compatibilities?

Things that are fast, big, hardy, and the setup is large, super filtered, and has rediculous water changes with turtles that are raised on pellets exclusively (no live foods to chase down), and are raised with the fish.

I never can understand why people keep slider turtles in 4 to 6 inches of water. If you have a 4ft 55gal tank, you could make a lot more swimming room by filling it up more. The rule with average aquatic turtles like RES or YBS is 10 gallons of water for every inch of turtle. So unless your turtles are an inch in diameter a piece you already need a new tank. RES's live in ponds and lakes that are waaaay deeper than your 55gal aquarium. Don't be scared to fill it up some more. Just keep it far enough below they cant climb out or keep a lid on it. But either way, you already need a bigger tank. To keep even one full grown RES you need at least a 110gal tank. You can get away with a 75gal if it's a male, as they dont grow quite as big. But eventually two of them together are going to need 200gal of water at least. SO you have to upgrade to an outdoor pond or a stock tank. Otherwise your going to stunt their growth, your already making them drink there own waste in high concentration, there isn't enough filtration in the world to keep 20 gallons of water containing two 6 inch turtles clean. If they were hatchlings or less than a year old, maybe

Well Jay has a point, if you have a tank might as well put at least a foot of water in it and make an island or dock for the turtles, then you can add fish, the more water you have in the tank the easier it is to keep clean, and the easier it is to maintain the temperature, plecos are a good idea as are plants that your turtles wont eat, have a lot of plants as they oxygenate the water and if the turtles munch on them there will be minimal damage as opposed to a few plants. Comet goldfish are a good idea, but remember not bite sized fish, and goldfish will eat crickets if you feed your turtles live crickets too.
And remember have fun with this, do not stress on it as there just is no need.